Lawyers for jailed ex-cop Charles Schwarz go back to court Thursday to argue his appeal in the Abner Louima brutality case.

Schwarz, 35, is serving a 15-year sentence for helping another officer sodomize the Haitian immigrant with a broken broomstick in 1997 in what is perhaps the worst case of police brutality in city history.

His lawyers will argue the Second Circuit Court of Appeals should toss out the conviction because prosecutors didn’t allow witnesses that would have cast doubt on the government’s version of the attack – and that supported Schwarz’s claim he was a victim of mistaken identity.

Schwarz’s lawyers won a minor victory July 6, when the appeals court ordered prosecutors to give the defense statements made by Schwarz’s fellow officers that were withheld at trial.

The defense needs to convince the court the statements could have had an impact on the verdict.

Lawyers for both sides refused to discuss the content of the statements, which were filed under seal.

“We’re gratified that the court turned them over to us,” Schwarz’s lead attorney, Ronald Fischetti, said yesterday. “We’re looking forward to the argument.”

U.S. Attorney Alan Vinegrad declined comment.

At the time of the trial, prosecutors denied withholding any evidence that would have helped the defense.

The Second Circuit will hear the case a week after the city and a police union agreed to pay Louima $8.75 million to settle a civil-rights lawsuit.